Exam2_Spring2007

Exam2_Spring2007 - ME zoo Spring zoos Exam 2 Tuesday March...

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Unformatted text preview: ME zoo Spring zoos Exam 2 Tuesday March 15 II You may use only your own book, your own notes [this includes course instructor notes you have written on] and any quizzes you were given in class. I You may not use any addifional material, such as another perlsons notes, other books, technical papers, solution manuals, old exams, anyone else’s homework. etc. o 1rlr'ou must turn off all communications devices before starting this exam, place them under your seat out of sight, and leave them off until you exit the examination room. . You must place all materials, other than your calculator. pencil. eraser, booltl'notEs, and this exam under your seat and not move them until you leave the exam hal] for the last time this evening. Recall that this includes any communications devices. a You must interpolate when necessary. You will not obtain full credit if you choose “the closest answer.” a You must follow the problem solution format to obtain I'ull credit. Name: Thermo No: CIRCLE YDUR DIVISIDN Div. I {3.3m Div. I (1031'!) Div. 3 {”3"} Dis. 4 {13“} Prof. Sojka Prof. Abraham Dr. Tree Dr. Son 1. (Part a is worth 12 pts. part b is worth 4 pts. and part i: is worth 18 pts) A new house is to be heated using a Carnot heat pump. The work required to nrperate the heat pump is supplied by a Carnot heat engine. A schematic of the eemhined heat pump-heat engine system is shown at right. losses Although the heat pump and heat engine are both ideal devices, only 50% of the work produced by the engine is received by the heat pump. a. Determine the magnitude oi" the work produced by the heat engine. Report your answer in lei. b. Determine the magnitude of the ninth received by the heat pump. Report your answer in lei. e. Determine the total amount oi‘heat transferred to the house, by adding the heat transferred from the heat engine to the house to the heat transferred From the heat pump to the house. Report your answer in id. :Ef {infill Cflh‘lfflb git?— .- T’I'J' :7) (w) LDQUDEE: Gflp: HIV—J h" (defiant) Quin- 1-... : Mme WE satisfied {if}? TC {Ettf'l‘h‘j : LIESl-tl fig? _. at? F D.UF[1 at? Gig : whiz Amman if; f thrill SHE -= ‘i‘lfifll I'Ffl GM -“ Gee Trap? :icsaaes tcai 2. [Part a is worth IE pts. part b is work 14 p15, and part c is worth 14 pts} 225 kthin of liquid water enters. a heat exchanger at 120 C and exits at 40 C. The water is cooled by passing 12°C air Through the heat exchanger at an inlet volume flow tale of lflflll msfmin. The air enters at i bar and 225 kgrmm transfer heat it: the sm‘reundings at a rate cf‘Sfl kW. The specific heats at constant pressure fer water and air are 4.18 klfltg-K and H305 klflcg-K. respectively. Determine a. the mass flow rate cf air, in kgimin. 11th: change in enthalpy of the water, in kJi'kg. c. the outlet temperature of the air in C. Cl" ' ,_ Z m(h+q;¥13{3 F E fixf‘nHT/g ‘fl‘éi 51M: exile Emmet = fiE.2£’___[ B ii 25 c and exits at 1 bar. The heat a exchanger is net insulated, and 50 kW 25 c 1 bar wee m’rmin firiewp—aafia 355% + lfiufg H 1’75 W“ EDEC ”wk-um: I. 4pc 3. {21} pte) Air exiting a gas turbine engine pasaea through a Inezzle. The neezle inlet eenditiena are 2am F, lflt] psi It] file. The area is ] 5ft. The nezzle exit conditions are 15 psi teen We and llflfl F 15 this nezzle adiabatic? It" net report the value of the heat transfer [in Btureee} and indiea whether energy flaws inte,01' out ef the nozzle G V. MW infra E (“H’tt'géj gag 'thgflle—m't—mt fl} = mtflfi-qke) =3: =11 (111111215) Bhf'nefl: _ *- 2.. 1 e. 1E3: [61% WE + a a 1% We EMCE q 751:1 MM: 11:31». Mamie; tea tamer ‘19 Sic-f WW ...
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